*{
    margin: 0;
    padding: 0;
}
.header{
    width:100%;
}
.header_img{
    width:990px;
    margin: 0 auto;
}
.img_box {
    widows: 158px;
    height: 248px;
    overflow: hidden;
    float: left;
}
.img_box img{
    width: 100%;
    transition: all 2s;
}
.img_box:hover img{
    transform: scale(0.8)
}
.blka .header-imgs{
    height: auto;
}
